So long as the act u ator remains i n the Reset posi
tion, the breaker can be c l osed and opened norm a l l y
a t w i l l . H owever, when a c losed breaker receives a
trip s i g nal from the programmer u n it, the act uator i s
energ ized a n d its solenoid f l ux opposes t h e magn�t.
al low i n g the spri ng to re lease the armat u re; t h 1 s
d rives t h e tri p rod agai nst t h e trip shaft padd l e , tri pp
i ng the breaker.
As the breaker opens, the actuator arm-i s retu rned
to its normal (Reset) position via l i n kage driven by a
cra n k on the breaker's main shaft. The permanent
mag net agai n holds the armat u re captive in read i n ess
for the next t r i p s i g na l .
T h e trip device req u i res only one adj u stment - t h e
t r i p rod l e n g t h . As shown rn F i g . 66, the cl earance
between the trip rod and the t r i p shaft paddle i s gaged
by a 0 . 1 09 i nc h d i ameter rod . Adj u st gap to 0. 1 09 i nc h
± 0.031 i nc h . To adj ust, o p e n the breaker a n d restore
the breaker mechan i sm to its Reset posit i o n . Loosen
the jam n ut , rotate the adj u ster end u n t i l the proper
gap is attai ned, then ret i g hten the j a m b nut to 35 ± 5
i n - l bs.
The actuator is a sealed, factory-set device and re
q u i res no mai ntenance or field adj ustment. In case of
malfunction, the comp lete actuator u n it should be
rep l aced . When making the electri cal con nector to
the replacement u n i t, it is recom mended that the brea
ker harness be cut at some conven ient point and the
new actu ator leads solder-sp l iced together.
The preferred method is to remove the flux s h i fter
leads from the A M P con nector u s i n g the A M P extrac
tion too l , Cat. No. 305 1 83 as fol lows:
TR I P
PA D DLE
C R A N K
(
B R E A K E R
)
CLOSED POSITION
S I D E
V I E W
MA I N
S H A F T
1 . Remove the flux s h i fter leads from the harness.
2. Referri ng to the cab l i ng d iag rams in Section 1 0.5,
the flux shifter leads are RED for point B and BLACK for
point E.
3. I n sert the extractor too l over the female p i n .
When t h e extractor tool bottoms out, depress the
p l u nger and force the w i re/socket assembly out of the
connector.
4. No tool i s req u i red to i n sert the wi re/socket
assembly i nto the connector. I n sert the assem bly un
til it snaps i nto p l ace.
5. Verify a l l soc kets are i n serted to the same depth.
CAUTION :
IN THE EVENT THA T THE SST TRIP DE
VICE MUST BE RENDERED INOPERA TIVE TO
A LL O W THE BREA KER TO CAR R Y CURRENT
WITHOUT BENEFIT OF OVERCURRENT PROTEC
TION, THE RECOMMENDED METHOD IS TO
SHORTEN THE TRIP ROD B Y TURNING ITS A D
JUSTER END FUL L Y CLOCKWISE. THIS PRE
VENTS A C TUA TION OF THE TRIP SHAFT PADDLE.
RESET
L I NKAGE
FRON T
V I E W
<?"
0
FIG. 64 - FLUX SHIFT TRIP DEVICE AND OPERATING LINKAG ES
49
www
. ElectricalPartManuals
. com
